gvpe/src/iom.h

/*
    iom.h -- I/O multiplexor
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#ifndef VPE_IOM_H__
#define VPE_IOM_H__

#include <vector>

#include <sys/poll.h>

#include "slog.h"

typedef double tstamp;

extern tstamp NOW;

template<class R, class A> class callback;
struct io_watcher;
struct time_watcher;

class io_manager {
  vector<pollfd> pfs;
  vector<io_watcher *> iow;
  vector<time_watcher *> tw; // actually a heap

  void idle_cb (tstamp &ts); time_watcher *idle;
public:

  // register a watcher
  void reg (int fd, short events, io_watcher *w);
  void unreg (io_watcher *w);
  void reg (time_watcher *w);
  void unreg (time_watcher *w);
  
  void loop ();

  io_manager ();
  ~io_manager ();
};

extern io_manager iom;

template<class R, class A>
class callback {
  struct object { };

  void *obj;
  R (object::*meth)(A arg);

  // a proxy is a kind of recipe on how to call a specific class method
  struct proxy_base {
    virtual R call (void *obj, void (object::*meth)(A), A arg) = 0;
  };
  template<class O1, class O2>
  struct proxy : proxy_base {
    virtual R call (void *obj, void (object::*meth)(A), A arg)
      {
        ((reinterpret_cast<O1 *>(obj)) ->* (reinterpret_cast<void (O2::*)(A)>(meth)))
          (arg);
      }
  };

  proxy_base *prxy;

public:
  template<class O1, class O2>
  callback (O1 *object, void (O2::*method)(A))
    {
      static proxy<O1,O2> p;
      obj  = reinterpret_cast<void *>(object);
      meth = reinterpret_cast<void (object::*)(A)>(method);
      prxy = &p;
    }

  R call(A arg)
    {
      return prxy->call (obj, meth, arg);
    }

  R operator ()(A arg)
    {
      return call (arg);
    }
};

struct io_watcher : callback<void, short> {
  template<class O1, class O2>
  io_watcher (O1 *object, void (O2::*method)(short revents))
    : callback<void, short>(object,method)
    { }

  void start (int fd, short events)
    {
      iom.reg (fd, events, this);
    }

  void stop ()
    {
      iom.unreg (this);
    }
};

#define TSTAMP_CANCEL -1.

struct time_watcher : callback<void, tstamp &> {
  tstamp at;

  template<class O1, class O2>
  time_watcher (O1 *object, void (O2::*method)(tstamp &))
    : callback<void, tstamp &>(object,method)
    { }

  void set (tstamp when);
  void trigger ();

  void operator ()()
    {
      trigger ();
    }

  void start ();
  void start (tstamp when)
    {
      set (when);
    }

  void stop ()
    {
      iom.unreg (this);
    }

  void reset (tstamp when = TSTAMP_CANCEL)
    {
      stop ();
      at = when;
    }
};

#endif

Revision:	1.4
Committed:	Fri Mar 21 23:17:01 2003 UTC (21 years, 2 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
Changes since 1.3:	+26 -5 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	pcg	1.1	/*
2			iom.h -- I/O multiplexor
3
4			This program is free software; you can redistribute it and/or modify
5			it under the terms of the GNU General Public License as published by
6			the Free Software Foundation; either version 2 of the License, or
7			(at your option) any later version.
8
9			This program is distributed in the hope that it will be useful,
10			but WITHOUT ANY WARRANTY; without even the implied warranty of
11			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12			GNU General Public License for more details.
13
14			You should have received a copy of the GNU General Public License
15			along with this program; if not, write to the Free Software
16			Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17			*/
18
19			#ifndef VPE_IOM_H__
20			#define VPE_IOM_H__
21
22			#include <vector>
23
24			#include <sys/poll.h>
25
26			#include "slog.h"
27
28	pcg	1.2	typedef double tstamp;
29	pcg	1.1
30	pcg	1.2	extern tstamp NOW;
31	pcg	1.1
32			template<class R, class A> class callback;
33			struct io_watcher;
34			struct time_watcher;
35
36			class io_manager {
37			vector<pollfd> pfs;
38			vector<io_watcher *> iow;
39			vector<time_watcher *> tw; // actually a heap
40	pcg	1.4
41			void idle_cb (tstamp &ts); time_watcher *idle;
42	pcg	1.1	public:
43
44			// register a watcher
45			void reg (int fd, short events, io_watcher *w);
46			void unreg (io_watcher *w);
47			void reg (time_watcher *w);
48			void unreg (time_watcher *w);
49
50			void loop ();
51
52			io_manager ();
53			~io_manager ();
54			};
55
56			extern io_manager iom;
57
58			template<class R, class A>
59			class callback {
60			struct object { };
61
62			void *obj;
63			R (object::*meth)(A arg);
64
65			// a proxy is a kind of recipe on how to call a specific class method
66			struct proxy_base {
67			virtual R call (void obj, void (object::meth)(A), A arg) = 0;
68			};
69			template<class O1, class O2>
70			struct proxy : proxy_base {
71			virtual R call (void obj, void (object::meth)(A), A arg)
72			{
73			((reinterpret_cast<O1 >(obj)) -> (reinterpret_cast<void (O2::*)(A)>(meth)))
74			(arg);
75			}
76			};
77
78			proxy_base *prxy;
79
80			public:
81			template<class O1, class O2>
82			callback (O1 object, void (O2::method)(A))
83			{
84			static proxy<O1,O2> p;
85			obj = reinterpret_cast<void *>(object);
86			meth = reinterpret_cast<void (object::*)(A)>(method);
87			prxy = &p;
88			}
89
90			R call(A arg)
91			{
92			return prxy->call (obj, meth, arg);
93			}
94	pcg	1.2
95	pcg	1.4	R operator ()(A arg)
96	pcg	1.2	{
97	pcg	1.4	return call (arg);
98	pcg	1.2	}
99	pcg	1.1	};
100
101			struct io_watcher : callback<void, short> {
102			template<class O1, class O2>
103	pcg	1.2	io_watcher (O1 object, void (O2::method)(short revents))
104	pcg	1.1	: callback<void, short>(object,method)
105	pcg	1.2	{ }
106
107			void start (int fd, short events)
108	pcg	1.1	{
109			iom.reg (fd, events, this);
110			}
111
112	pcg	1.4	void stop ()
113			{
114			iom.unreg (this);
115			}
116	pcg	1.1	};
117
118	pcg	1.4	#define TSTAMP_CANCEL -1.
119
120	pcg	1.2	struct time_watcher : callback<void, tstamp &> {
121			tstamp at;
122
123			template<class O1, class O2>
124			time_watcher (O1 object, void (O2::method)(tstamp &))
125			: callback<void, tstamp &>(object,method)
126			{ }
127	pcg	1.1
128	pcg	1.2	void set (tstamp when);
129	pcg	1.4	void trigger ();
130	pcg	1.1
131	pcg	1.4	void operator ()()
132	pcg	1.1	{
133	pcg	1.4	trigger ();
134	pcg	1.1	}
135
136	pcg	1.4	void start ();
137			void start (tstamp when)
138	pcg	1.1	{
139	pcg	1.2	set (when);
140	pcg	1.4	}
141
142			void stop ()
143			{
144			iom.unreg (this);
145			}
146
147			void reset (tstamp when = TSTAMP_CANCEL)
148			{
149			stop ();
150			at = when;
151	pcg	1.1	}
152			};
153
154			#endif
155